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Full text of "Flora Indica Vol-I"

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CONTENTS.                                                       XJ
B. On J*ariation of Sjpecf-tis.
Ignorance of laws governing variation—Indications of laws deduced
from considerations of climatic conditions and distribution—U-cnc-
ral rules deduciblo from them.....'.        .24
Arguments from the permanence of forms of foreign plants in the
Calcutta Botanic Gardens—Specific -effects of climate in altering
familiar plants difficult of appreciation, because of impossibility of
recollecting habit, and interference of local associations . . 25
Relations between climate and development of species in India as in-
stanced by the Floras of equable and extreme climates . . .26
Comparison with the Floras of the Cape of Good Hope, Australia,
etc.; prim A facie evidence a (Ton led in favour of definite creations
of species ........... 27
Variation of species a fruitful study—1. Variation in organs of indi-
viduals easily studied 'in India—Changes during growth in differ-
ent parts of the individual, in distribution of the sexes . . .27
Exaggerated estimates of spmos of known plants due in part to narrow
id«iH of power of variation—Relative size and symmetry not im-
portant, in the Vegetable Kingdom, as compared with the Animal . 28
Variations in lloral organs j ovary, carpels, sepals      .        .        .        .29
2. Variation between different individuals of the same species   .        .    29
This a fertile source of bad species—Variation in colour of ilowers,
odour, hairiness, medicinal and economic properties—Variations
from change of locality—Necessity of studying variations amongst
gregarious *planta —Instances in the Cedar, Deodar, and other Co-
nifera, Phea WMfana and Abies Smithiana . . . ,30
Arguments from different wood of the ssuue native tree in Britain,
Europe, etc...........32
Development of medicinal and other properties, as in Tea, Opium,
etc., in India ..........32
Habit—Erroneous importance attached to.....32
Illustrated by Tinea and other European and Indian trees, shrubs,
and horbfl ....                                                     y3,34
Arguments dcritod from  European cultivated trees—False imprccj-
• c-iona of li&bita of common trees, instanced by the Deodar in .Eng-
land—Desirability of purouiug the s,iudy of species on a different
0. Geographical JOistribtttion,
Difficulties in thowayof its study, with, reference to India especially—
Our ignorance of the prominent features of Indian vegetation—Want
of any work on the subject........36
Necessity of ntiwlymg tho rupluecmont, appearance, am* disappearance
*»J* type* —Anomalies in distribution of Indian plants—^Absence of
'Onkrt and Piuo« hi the (Vmuwila, arid of Cycwfote in Ceylmi . , 37
Gr*tir in'.TeaH<v to Huvp^-'i numlwitof si>e<:ios arising fix>m zuintalten